This is a specific conversation about Wet vs dry cat food — the honest answer — ask about yours and get one honest answer for your exact situation.
inparticular.ai
A shared bowl with one overweight cat and one underweight cat is genuinely one of the harder feeding situations to solve — because whatever you put down, the wrong cat tends to eat more of it. Before I get into options, quick questions: how old are your Siamese and Persian, do either of them have any health conditions diagnosed by a vet, and are you currently feeding wet, dry, or a mix?
The Siamese is 4 and the Persian is 6. No health issues, both vet-checked recently. We're doing dry food left out all day, same bowl. The Persian is the chunky one, Siamese is too thin.
inparticular.ai
That free-feeding dry food setup is almost certainly the root of the problem. The Persian is grazing all day and taking more than her share, while the Siamese — who tends to be more anxious and food-competitive — is probably getting pushed out at moments and then not eating enough to compensate. Persians are also prone to weight gain because they're naturally less active. The fix here isn't really about the food itself, it's about separating the feeding entirely. How does your home layout look — do you have the ability to feed them in different rooms, or on different levels?
We could feed them in separate rooms, yeah. We've just never bothered. Would that actually make enough of a difference?
inparticular.ai
It makes the biggest difference of anything you can do, honestly. Once you separate them, you control exactly how much each cat gets. For the Persian you portion-control a light wet food — wet food is more filling per calorie than dry, so she feels satisfied on less. For the Siamese you can be more generous. The product I'd point you to is Royal Canin's breed-specific pouches: they do a Siamese Adult and a Persian Adult wet food, both designed around the specific needs of those breeds — the Persian one in particular is formulated to help with weight management. Feed them separately, twice a day, measure the portions. That alone will sort this out within a few weeks.
I didn't know Royal Canin did breed-specific wet food. Is it actually meaningfully different or is that just marketing?
inparticular.ai
It's a fair question and the honest answer is: partly real, partly marketing. The Persian formula genuinely has a different calorie density and is easier for flat-faced cats to eat — Persians can struggle with standard-shaped food pieces because of their jaw structure. The Siamese formula has higher protein to support their lean, active build. The differences are real but not miraculous. What matters more is the portion separation. That said, if you're going to buy two separate foods anyway, you may as well get ones calibrated for those breeds. The Royal Canin Persian Adult pouches are around £18-20 for a 12-pack on Amazon UK, and the Siamese ones are similar. Both are easy to find.
That seems reasonable. So just to confirm — stop the free-feeding dry food completely, switch to twice-daily wet food in separate rooms?
inparticular.ai
Exactly that. Stop the all-day dry food, move to two meals a day, different rooms, close the doors while they eat. Give the Persian roughly the lower end of the recommended portion on the pack, and the Siamese the upper end or slightly above given she's underweight. Reassess in four weeks — you should see the Persian trimming down and the Siamese filling out. If either one is still not moving in the right direction after a month, that's when it's worth another vet conversation. But in my experience, just removing the shared bowl solves 80% of this.
